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181 lines
5.3 KiB
C
181 lines
5.3 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Gzip implementation for busybox
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*
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* Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
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*
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* Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
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* based on gzip sources
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*
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* Adjusted further by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
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* to support files as well as stdin/stdout, and to generally behave itself wrt
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* command line handling.
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*
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* General cleanup to better adhere to the style guide and make use of standard
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* busybox functions by Glenn McGrath <bug1@optushome.com.au>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*
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* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
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* Copyright (C) 1992-1993 Jean-loup Gailly
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* The unzip code was written and put in the public domain by Mark Adler.
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* Portions of the lzw code are derived from the public domain 'compress'
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* written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
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* Ken Turkowski, Dave Mack and Peter Jannesen.
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*
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* See the license_msg below and the file COPYING for the software license.
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* See the file algorithm.doc for the compression algorithms and file formats.
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*/
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#if 0
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static char *license_msg[] = {
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" Copyright (C) 1992-1993 Jean-loup Gailly",
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" This program is free software; you can redistribute it and/or modify",
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" it under the terms of the GNU General Public License as published by",
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" the Free Software Foundation; either version 2, or (at your option)",
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" any later version.",
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"",
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" This program is distributed in the hope that it will be useful,",
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" but WITHOUT ANY WARRANTY; without even the implied warranty of",
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" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the",
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" GNU General Public License for more details.",
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"",
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" You should have received a copy of the GNU General Public License",
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" along with this program; if not, write to the Free Software",
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" Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.",
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0
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};
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <getopt.h>
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#include "busybox.h"
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extern int gunzip_main(int argc, char **argv)
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{
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FILE *in_file, *out_file;
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struct stat stat_buf;
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char *if_name = NULL;
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char *of_name = NULL;
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char *delete_file_name = NULL;
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const int gunzip_to_stdout = 1;
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const int gunzip_force = 2;
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const int gunzip_test = 4;
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int flags = 0;
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int opt = 0;
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int delete_old_file = FALSE;
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/* if called as zcat */
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if (strcmp(applet_name, "zcat") == 0)
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flags |= gunzip_to_stdout;
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while ((opt = getopt(argc, argv, "ctfhdq")) != -1) {
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switch (opt) {
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case 'c':
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flags |= gunzip_to_stdout;
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break;
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case 'f':
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flags |= gunzip_force;
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break;
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case 't':
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flags |= gunzip_test;
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break;
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case 'd': /* Used to convert gzip to gunzip. */
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break;
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case 'q':
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error_msg("-q option not supported, ignored");
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break;
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case 'h':
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default:
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show_usage(); /* exit's inside usage */
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}
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}
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/* Set input filename and number */
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if (argv[optind] == NULL || strcmp(argv[optind], "-") == 0) {
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flags |= gunzip_to_stdout;
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in_file = stdin;
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} else {
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if_name = strdup(argv[optind]);
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/* Open input file */
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in_file = xfopen(if_name, "r");
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/* Get the time stamp on the input file. */
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if (stat(if_name, &stat_buf) < 0) {
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error_msg_and_die("Couldn't stat file %s", if_name);
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}
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}
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/* Check that the input is sane. */
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if (isatty(fileno(in_file)) && (flags & gunzip_force) == 0)
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error_msg_and_die("compressed data not read from terminal. Use -f to force it.");
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/* Set output filename and number */
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if (flags & gunzip_test) {
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out_file = xfopen("/dev/null", "w"); /* why does test use filenum 2 ? */
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} else if (flags & gunzip_to_stdout) {
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out_file = stdout;
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} else {
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char *extension;
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int length = strlen(if_name);
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delete_old_file = TRUE;
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extension = strrchr(if_name, '.');
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if (extension && strcmp(extension, ".gz") == 0) {
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length -= 3;
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} else if (extension && strcmp(extension, ".tgz") == 0) {
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length -= 4;
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} else {
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error_msg_and_die("Invalid extension");
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}
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of_name = (char *) xcalloc(sizeof(char), length + 1);
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strncpy(of_name, if_name, length);
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/* Open output file */
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out_file = xfopen(of_name, "w");
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/* Set permissions on the file */
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chmod(of_name, stat_buf.st_mode);
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}
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/* do the decompression, and cleanup */
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if (unzip(in_file, out_file) == 0) {
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/* Success, remove .gz file */
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delete_file_name = if_name;
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} else {
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/* remove failed attempt */
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delete_file_name = of_name;
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}
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fclose(out_file);
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fclose(in_file);
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if (delete_old_file == TRUE) {
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if (unlink(delete_file_name) < 0) {
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error_msg_and_die("Couldnt remove %s", delete_file_name);
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}
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}
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free(of_name);
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return(EXIT_SUCCESS);
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}
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